Ultra-Wideband Array with Multi-Layer Frequency Selective Surface Resistive-card and 51.4:1 Bandwidth

In this conference, a novel ultra-wideband (UWB) array is presented that covers the UHF to Ku-bands (0.35 – 18 GHz). The array incorporates two frequency-selective surface (fss) resistive-card (R-card) in the substrate to suppress resonances within the operational band. A highly improved impedance matching and wide-angle scanning with a fss superstrate is employed. Notably, this arrays achieves a 51.4:1 impedance bandwidth at broadside with VSWR < 3 across most of the operational band. The proposed design and innovation are significant in improving and expanding the technology of array antennas, and opening up new possibilities for future applications.